Punching machine



FIG. 1 is a front left side perspective view of a punching machine showing my new design;

FIG. 2 is a right side elevation view thereof

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof; and,

FIG. 6 is a top plan view thereof.

The broken lines in the drawings depict unclaimed environmental subject matter. 

CLAIM The ornamental design for a punching machine, as shown and described. 